Sunken Concrete Slab Leveling & Trip Hazard Repair in Gaithersburg, MD

Sunken concrete is a slab or panel that has dropped below the elevation of the surrounding concrete, creating an uneven transition between the two. The height difference — sometimes an inch or more — creates a trip hazard on walkways, a lip at driveway transitions, and a low spot where water collects. Sunken slabs are common on sidewalks, driveways, patios, and walkways across Gaithersburg properties.

Sunken concrete repair focuses on addressing the height difference and the trip hazard it creates. Depending on the slab's condition, that may involve leveling — raising the settled slab back toward its original elevation — or replacement when the slab is too damaged to lift. The goal is to eliminate the trip hazard and restore a safe, even surface.

Because not every settled slab can be lifted, the planning phase — slab condition, crack extent, and underlying cause — determines whether leveling or replacement is the right approach. A slab that is cracked through or severely deteriorated may not hold during lifting, and those situations need replacement instead. We assess the slab before recommending an approach.

Settled concrete shows recognizable signs that a slab has dropped below its original elevation. Identifying these signs — and how severe the settlement is — is the first step in determining whether leveling or replacement is appropriate.

Signs of Settlement

• Height differences between adjacent slab panels
• Water pooling in low spots where the slab has dropped
• Uneven joints where one side sits lower than the other
• Sloped panels that tilt toward a settled area
• Entry transitions where a step height has changed
• Trip points at panel edges and transitions
• Movement from adjacent slabs that have shifted at different rates

The severity of the settlement affects the repair approach. A slab that has dropped slightly and is still intact may be a good leveling candidate, while a slab that has dropped significantly, cracked, or broken into pieces may need replacement. We assess the height difference, crack extent, and slab condition before recommending an approach.

Concrete leveling raises a settled slab back toward its original elevation by filling the void beneath it and lifting the concrete from below. The process is conceptually straightforward, but it depends on the slab being intact enough to lift.

1. 1Evaluation — assess the slab's condition, settlement extent, and whether it can be lifted.
2. 2Slab condition check — confirm the concrete is not cracked through or severely deteriorated.
3. 3Identifying the settled area — map where the slab has dropped and by how much.
4. 4Lifting approach — plan the leveling method based on the slab and site conditions.
5. 5Void filling — fill the space beneath the slab that caused the settlement.
6. 6Mudjacking or appropriate lifting methods — raise the slab in a controlled manner.
7. 7Access-point repair — patch the holes used for the lifting process.

We do not claim all slabs can be lifted. A slab that is cracked through, broken into pieces, or severely deteriorated may not hold during lifting, and those situations need replacement instead. We assess whether leveling is appropriate for the specific slab before recommending it.